[browser] tests and fixes for heap larger than 2GB

[pavelsavara]

WBT

• set <EmccMaximumHeapSize>4294901760</EmccMaximumHeapSize>
• allocate large arrays in order to deplete memory below 2GB
• after that
  • test marshaling array of string via JSImport
  • call some method many times to trigger interp tier-up and jiterp

Potential fixes needed

• convert all results of Module._malloc from int to uint
  • in jiterp
  • in JS interop

See also #99114

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[lewing]

@kg can you take a look at the jiterp side of things?

[pavelsavara]

probably also negative results from sbrk